Aeroplane level-indicator



J. S. COXEY.

AEROPLANE LEVEL INDICATOR.

' 'IN VENTYI I J'flsPER s. Ey

/ ATTORNEY Patented Dec. 7, 1920. 4 2 suams smzer 1.

. llll NTOR JASPER s, ooxzy ATTORNEY fee v racism;

preferably of non-freezing properties, 2 isa spherically shaped ball of such com-' siren; STATES PATENTNOFFICE.

JAsPEa s. COXEY, or ABERDEEN; WASHINGTON.

AEROPLAIl'E LEVEL-INDICATOR. I

Aberdeen, in the county of Grays Harborand State of Washington, have invented a new and useful Improvement in Aeroplane Level-Indicators, of which the followlng is a specification.

'\ This invention relates to new and useful Specification of Letters Patent. v Patented Dec. .7 1920 Application filed July 25, 1918. Serial No. 247,460. 7

- plane. These bands can be graduated in S; CoxEY, a

degreesofany denomination from zero to 90 degrees.

It is thus obvious that the pilot can note the position of either the air bubble 4 or ball 2 with respect to the center of gravity of the device, and by glancing at the scale of the section the bubble or ball is-visible improvements in aeroplane level indicators for indicating to the pilot thereof the degree of inclination the machine may be from v the horizontal or vertical plane, andthe object of this improvement is to provide a device that is simple in the design ofv its construction and positive in its degree of accuracy. r

A further object resides in thecombination of two indicating means visible to the pilot of the machine whereby he can determine at a glance the degree of inclination the machine is tilted from t@ horizontal or vertical plane.

Further objects will appear from the fol lowing specification, illustratedin the accompanying drawings, and'finally pointed out in the appended claim.

In the drawings, elevation of a sphere which constitutes the form of my device; Fig. 2 is a plan of the spherically shaped device embodying the design of marking the area off into sections; Fig.3 is an alternative plan-of marking the areaoff into sections, showing the sphere at an inclination from the vertical; and Fig. 4 is a plan of the same in vertical position.

Referring more particularly to the drawings, in which likerreference numerals indicate like parts, spherically shaped receptacle, in the form of a globe, within which is disposed'liquig position as will not efl'fcta' discoloration of the liquid as to rendefthe" glass of which the. sphere is constructed opaque, and

within, can instantly ascertain the degree of incl nation the machine is tilted from the vertical or horizontal plane; as, for instance,

should the machine be flying at an ascent of I 15 degrees, with an inclination of 30 degrees from the-horizontal plane to either left or right, or whether the machine is descend-' ing at the same corresponding inclinations, the bubble or ball would be directly under the particular section indicated by the de- Figure 1 is a sectionalv gree number upon the band 3. k

In Figs. 3 and 4 is shown an alternative means of indicating the degrees of variation from the horizontal or vertical plane. In place of the bands 3 beingfplaced' around the periphery of the sphere, and having indicated thereon the degrees from the center of gravity at the vertical to the horizontal plane, the sphere is laid out in sections and the degrees are indicated upon each section line, the section lines being laid out in merids ian and parallel lines like the globe, the parallel lines being marked in degrees fr'dm at the equator to both poles, the parallel lines on both sides of the equator being marked respectively in degrees 72, 54, 36 and 18, and the meridian lines being marked in degrees from the axis, zero, on both, sides respectively 15, 30, 45, 60, 75 and 90,

is obvious that an aeroplane equipped with a deviceof this character would be of the numeral 1' indicates a thereby conceal from vision the position of g especial value to-the pilotof an aeroplane at nighttime when his'vision of the earth is obscured by darknessor foggy weather,

It is further obvious that a device of this character would be particularly advantageous to new and inexperienced, pilots in indicating to them mechanicallythe angle inclination of their machine with respect to the horizontal plane, and thereby enable them to avert many accidents until. they have become more experienced and have reached a degree of efiiciency and lnstinc- I tively develop a sense. of balance.

Having thus, described my invention,

what I claim as new, and desire to protect by Letters Patent, is

In" combination, -a hollow transparent body of spherical form filled with liquid to form an air bubble, a ball of relativelybands placed about the outer periphery of the spherical body in planes at right angles to each othenand having indicia thereon forming a scale for determining the defle c- 10v tion of the ball and bubble Within the body. Signed by me at I Seattle, Washington, this 3d day of May, 1918. i

" JASPER COXEY.

Witnesses:

E. B. HERALD, D. C. KUHNS. 

